doc: Archive 30.3 release notes

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+v30.3 Release Notes
+===================
+
+Bitcoin Core version v30.3 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-30.3/>
+
+This release includes new features, various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes in some cases), then run the
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on macOS)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the data directory needs to be migrated. Old
+wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and tested on operating systems using the
+Linux Kernel 3.17+, macOS 13+, and Windows 10+. Bitcoin
+Core should also work on most other Unix-like systems but is not as
+frequently tested on them. It is not recommended to use Bitcoin Core on
+unsupported systems.
+
+Notable changes
+===============
+
+This release fixes an issue where the chainstate database would repeatedly
+rewrite large portions of itself, causing excessive disk reads and writes
+during normal operation.
+
+### Validation
+
+- #35209 validation: correct lifetime of precomputed tx data
+- #35465 coins: compact chainstate regularly
+
+### Leveldb
+
+- #61(bitcoin-core/leveldb): Disable seek compaction
+
+### Wallet
+
+- #34358 wallet: fix removeprunedfunds bug with conflicting transactions
+- #34870 wallet: feebumper, fix crash when combined bump fee is unavailable
+- #34888 wallet: fix amount computed as boolean in coin selection
+- #35228 wallet: use outpoint when estimating input size
+
+### Net
+
+- #34093 netif: fix compilation warning in QueryDefaultGatewayImpl()
+- #34549 net: reduce log level for PCP/NAT-PMP NOT_AUTHORIZED failures
+
+### PSBT
+
+- #34272 psbt: Fix PSBTInputSignedAndVerified bounds assert
+- #34219 psbt: validate pubkeys in MuSig2 pubnonce/partial sig deserialization
+
+### Miniscript
+
+- #34434 miniscript: correct and_v() properties
+
+### Build
+
+- #34228 depends: Unset SOURCE_DATE_EPOCH in gen_id script
+- #34281 build: Temporarily remove confusing and brittle -fdebug-prefix-map
+- #34554 build: avoid exporting secp256k1 symbols
+- #34627 guix: use a temporary file over sponge, drop moreutils
+- #34713 depends: Allow building Qt packages after interruption
+- #34754 depends: Qt fixes for GCC 16 compatibility
+- #34787 build: fix native macOS deployment
+- #34848 cmake: Migrate away from deprecated SQLite3 target
+- #34956 depends, qt: Fix build on aarch64 macOS 26.4
+
+### Test
+
+- #34185 test: fix feature_pruning when built without wallet
+- #34282 qa: Fix Windows logging bug
+- #34390 test: allow overriding tar in get_previous_releases.py
+- #34409 test: use ModuleNotFoundError in interface_ipc.py
+- #34445 fuzz: Use AFL_SHM_ID for naming test directories
+- #34608 test: Fix broken --valgrind handling after bitcoin wrapper
+- #34690 test: Add missing timeout_factor to zmq socket
+- #34869 tests: applied PYTHON_GIL to the env for every test
+- #34918 fuzz: [refactor] Remove unused g_setup pointers
+- #35080 test: Add missing self.options.timeout_factor scale in tool_bitcoin_chainstate.py
+
+### Util
+
+- #34597 util: Fix UB in SetStdinEcho when ENOTTY
+
+### Doc
+
+- #34252 doc: add 433 (Pay to Anchor) to bips.md
+- #34413 doc: Remove outdated -fdebug-prefix-map section in dev notes
+- #34510 doc: fix broken bpftrace installation link
+- #34561 wallet: rpc: manpage: fix example missing `fee_rate` argument
+- #34671 doc: Update Guix install for Debian/Ubuntu
+- #34702 doc: Fix fee field in getblock RPC result
+- #34706 doc: Improve dependencies.md IPC documentation
+- #34789 doc: update build guides pre v31
+- #35283 doc: mention -DWITH_ZMQ=ON in BSD build guides
+
+### CI
+
+- #32513 ci: remove 3rd party js from windows dll gha job
+- #34344 ci: update GitHub Actions versions
+- #34453 ci: Always print low ccache hit rate notice
+- #34461 ci: Print verbose build error message in test-each-commit
+- #34802 ci: Bump GHA actions versions
+- #34815 ci: bump cirruslabs actions versions
+- #35202 ci: restore sockets in i686, no IPC job
+- #35378 ci: switch runners from cirrus to warpbuild
+- #35408 ci: 35378 followups
+
+### Misc
+
+- #35175 multi_index: fix compilation failure with boost >= 1.91
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- ANAVHEOBA
+- andrewtoth
+- brunoerg
+- Cory Fields
+- Daniel Pfeifer
+- darosior
+- fanquake
+- furszy
+- Hennadii Stepanov
+- jayvaliya
+- junbyjun1238
+- kevkevinpal
+- Lőrinc
+- m3dwards
+- marcofleon
+- MarcoFalke
+- mzumsande
+- nervana21
+- Padraic Slattery
+- ryanofsky
+- Sebastian Falbesoner
+- SomberNight
+- tboy1337
+- theuni
+- ToRyVand
+- willcl-ark
+
+As well as to everyone that helped with translations on
+[Transifex](https://explore.transifex.com/bitcoin/bitcoin/).